Rob Danielson wrote:
>
>>> ... Curt Olson has some great wooden wedge/boundary designs
>>> http://www.trackseventeen.com/mic_arrays/ which could probably be
>>> modified/made out of lighter materials.
I replied:
>> FYI, that page badly out of date. Soon after posting it in May, I
>> realized that the wedge/boundary array at the bottom of the page was
>> giving me too much bass response,
Dan Dugan added:
> Were they omni mics mounted in the boards? I'm curious about the
> nature of "too much bass response."
183s flush-mounted through 1/2" holes in 1x6 pine stock, thus
incorporating the capsules into a boundary. My seat-of-the-pants
observation is that this seems to accentuate the the already-ample low
end of the 183s. I believe mic theory would predict this too, if I
understand correctly.
I'll continue beyond the scope of your question. The reason for the
boundaries is that in my experience, spaced omnis can give terrific
stereo imaging in an enclosed space with a specific targeted sound
source, such as a choir or orchestra. But for outdoor ambience, phase
interaction between the mics makes imaging a mess and destroys mono
compatibility every time. (I'm talking about close spacing here -- say
4" - 9" -- that someone can easily carry in the field, not wide
spacing.) But when the mics are incorporated into boundary, this phase
interaction at close distances seems to be virtually eliminated while
the distinct and desirable omni characteristics seem to be preserved --
with a little low-end boost thrown in.
I've focused most of my tinkering on learning the effects of boundary,
size, shape, material, spacing, angles, and positioning of the mics
relative to the edges of the boundary. The idea is to end up with a
nice stereo spread that is spacious and also accurate as to sound
source vectoring. I suppose I could go buy a SASS and be done with it,
but that would spoil all the fun!
Incidentally, Dan, I appreciated your PDF about the mic vest. You
showed us a photo of it a long time ago, and I've thought about if
often since. I'm still resisting a strong urge to start down that road
too...
Curt Olson
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